public class Test {
    String str=new String("good");
    char[] ch={'a','b','c'};
    public void change(String str,char ch[]){
        str="test ok";
        ch[0]='g';
    }
public static void testException(int a){
    if(a==0){
        throw new ArithmeticException();
    }
}
    public static void main(String[] args) {
        testException(0);
    }
    public static void main1(String[] args) {
        Test ex = new Test();
        ex.change(ex.str, ex.ch);
        System.out.println(ex.str + "and");
        System.out.println(ex.ch);
    }
}

